Here the results of running:
[nldudok1@quark incoming]$ /var/ftp/incoming/psim/freebsd/bin/powerpc-netbsd-run
-f /var/ftp/incoming/trees/cagney_tree_real /var/ftp/incoming/netbsd_ofppc_ca
gney_half_stripped
Copyright (c) 1996, 1997, 1998, 1999, 2000
The NetBSD Foundation, Inc. All rights reserved.
Try downloading the current GDB sources (http://sources.redhat.com/gdb/current/ and then run things under GDB:
(gdb) file netbsd.gdb
(gdb) target sim -f tree
(gdb) run
When the trap is hit, type cntrl-c and you should have all the normal
GDB facilities available.
Andrew